SELE'NIUM, n. [supra.] A new elementary body or substance, extracted from the pyrite of Fahlun in Sweden. It is of a gray dark brown color, with a brilliant metallic luster, and slighty translucent. It is doubted whether it ought to be classified with the metals.
SE-LE'NI-UM, n. [supra.]
An elementary acidifying and basifying substance, extracted from the pyrite of Fahlun in Sweden. It is a solid of a gray dark brown color, with a brilliant metallic luster, and slightly translucent.
- A nonmetallic element of
the sulphur group, and analogous to sulphur in its compounds. It is
found in small quantities with sulphur and some sulphur ores, and
obtained in the free state as a dark reddish powder or crystalline
mass, or as a dark metallic-looking substance. It exhibits under the
action of light a remarkable variation in electric conductivity, and
is used in certain electric apparatus. Symbol Se. Atomic weight